java - 违反参照完整性约束 - 添加超过 2 条记录时失败

Question

当我加载我的初始测试数据时，我检索到违反完整性约束的异常。它只发生在我使用 addShift 方法添加超过 2 条记录时。我在内存数据库中使用 h2。

正在加载:

public void load() {
    shiftService.addShift(1, LocalDate.now(), ShiftType.DAY, 1);
    shiftService.addShift(2, LocalDate.now().plusDays(1), ShiftType.NIGHT, 1);
    shiftService.addShift(2, LocalDate.now().plusDays(5), ShiftType.NIGHT, 2);
}

轮类服务:

@Transactional
public void addShift(long userId, LocalDate shiftDate, ShiftType shiftType, long groupId) {
    Optional<User> user = userService.findOne(userId);
    if (user.isPresent()) {
        Optional<Group> group = groupService.getOne(groupId);
        if (group.isPresent()) {
            Shift shift = new Shift(shiftDate, shiftType, group.get());
            user.get().addShift(shift);
        }
    }
}

原因:

org.h2.jdbc.JdbcSQLException: Referential integrity constraint 
violation: "FKG5R8KJRL3GG3EKESMHT77GO7L: PUBLIC.SHIFT FOREIGN KEY(ID) 
REFERENCES PUBLIC.GROUPS(ID) (3)"; SQL statement:
insert into shift (id, group_id, shift_date, shift_type) values (null, ?, ?, 
?) [23506-196]

型号:

类次:

@Entity
public class Shift {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    private LocalDate shiftDate;
    private ShiftType shiftType;

    @ManyToMany(cascade = CascadeType.ALL)
    @JoinTable(name = "user_shifts", joinColumns = @JoinColumn(name = "shift_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "user_id", referencedColumnName = "id"))
    private Set<User> users = new HashSet<>();

    @ManyToOne(cascade = CascadeType.ALL)
    @JoinColumn(name = "group_id")
    private Group group;

组:

@Entity
@Table(name = "groups") // Group is reserved name in SQL
public class Group {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;

    private String name;

    @ManyToMany(cascade = CascadeType.ALL)
    @JoinTable(name = "user_group", joinColumns = @JoinColumn(name = "group_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "user_id", referencedColumnName = "id"))
    private Set<User> users = new HashSet<>();

    @ManyToMany(cascade = CascadeType.ALL)
    @JoinTable(name = "moderator_group", joinColumns = @JoinColumn(name = "group_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "user_id", referencedColumnName = "id"))
    private Set<User> moderators = new HashSet<>();

    @OneToMany(mappedBy = "id", cascade = CascadeType.ALL)
    private Set<Shift> shifts;

用户:

@Entity
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;

    private String email;
    private String password;
    private String firstName;
    private String lastName;
    private String phone;

    @ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
    @JoinTable(
            name = "user_authority",
            joinColumns = {@JoinColumn(name = "user_id", referencedColumnName = "id")},
            inverseJoinColumns = {@JoinColumn(name = "authority_name", referencedColumnName = "name")}
    )
    private Set<Authority> authorities = new HashSet<>();

    @ManyToMany(cascade = CascadeType.ALL)
    @JoinTable(
            name = "user_group",
            joinColumns = {@JoinColumn(name = "user_id", referencedColumnName = "id")},
            inverseJoinColumns = {@JoinColumn(name = "group_id", referencedColumnName = "id")}
    )
    private Set<Group> usingGroups = new HashSet<>();

    @ManyToMany(cascade = CascadeType.ALL)
    @JoinTable(
            name = "moderator_group",
            joinColumns = {@JoinColumn(name = "user_id", referencedColumnName = "id")},
            inverseJoinColumns = {@JoinColumn(name = "group_id", referencedColumnName = "id")}
    )
    private Set<Group> moderatingGroups = new HashSet<>();

    @ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    @JoinTable(
            name = "user_shifts",
            joinColumns = {@JoinColumn(name = "user_id", referencedColumnName = "id")},
            inverseJoinColumns = {@JoinColumn(name = "shift_id", referencedColumnName = "id")}
    )
    private Set<Shift> shifts = new HashSet<>();

你知道为什么我会得到这个异常吗？

Answer 1

您在 Group 中的映射是错误的。

@OneToMany(mappedBy = "id", cascade = CascadeType.ALL)
private Set<Shift> shifts;

这应该是:

@OneToMany(mappedBy = "group", cascade = CascadeType.ALL)
private Set<Shift> shifts;

解释:

Hibernate 在 shift 中的 id 和 group 中的 id 之间添加外键约束。您可能正在添加 2 个组，并且在您尝试添加超过 2 个类次后，约束未满足，因为 ID 为 3 的组不存在。